flyback cooling

[DaveWM]

My recently replaced flyback in a CTC-12 gets pretty warm, like 150f after about 45 min running, it looked like a NOS fly, dripped out quite a bit of wax. I have read in old service manuals that it is not uncommon, and indeed most of the sets I find that have OEM flys do indeed have a moderate to large amount of wax loss. I have checked out the HV and it all seems well (correct HOT cathode current and screen voltages, regulation current, HV setting).

I was considering installaing a small muffin fan on set. I would do this by fabricating a new top for the HV cage, with a small (1" to 2") fan blowing down and a vent hole next to it to allow the air to escape. would add a thin non conductive divider to act as a plenum down to the fly to make sure the air path is not short circuited. I have seen many sets that just have the HV cage removed, perhaps to aid cooling?

I realize the down side is the large volume of air will result in a large volume of dust, if that is the case maybe a airfilter on the intake side. I don't think I will be using it frequently enough to clog the filter, I would just like to watch a 2 hour movie and not be fretting of a too hot flyback.

oh and ROLL TIDE...